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A calcium–aluminium-rich inclusion or Ca–Al-rich inclusion (CAI) is a submillimeter- to centimeter-sized light-colored calcium- and aluminium-rich inclusion found in carbonaceous chondrite meteorites. The four CAIs that have been dated using the Pb-Pb chronometer yield a weighted mean age of 4567.30 ± 0.16 Myr.
The following inclusion types can also be found in aluminium alloys: alumina needles (Al 2 O 3), nitrides (AlN), iron oxides (FeO), manganese oxides (MnO), fluorides (Na 3 AlF 6, NaF, CaF 2, …), aluminium borides (AlB 2, AlB 12), borocarbides (Al 4 C 4 B). Bone ash (Ca 3 (PO 4) 2) sometimes added to patch cracks in the trough can be found as ...
Al-Ca composite is a high-conductivity, high-strength, lightweight composite consisting of sub-micron-diameter pure calcium metal filaments embedded inside a pure aluminium metal matrix. The material is still in the development phase, but it has potential use as an overhead high-voltage power transmission conductor . [ 1 ]
The main constituent, and also the most reactive phase, of calcium aluminate cements is the monocalcium aluminate (CaAl 2 O 4 = CaO · Al 2 O 3, also written as CA in the cement chemist notation). It usually contains other calcium aluminates as well as a number of less reactive phases deriving from impurities in the raw materials.
The replacement of one divalent Ca 2+ cation by a trivalent Al 3+ cation, or to a lesser extent by a Fe 3+ cation, with a Ca:Al ratio of 2:1 (one Al substituted for every 3 cations) causes an excess of positive charge in the sheet: 2[2Ca (OH) 2 ·(Al,Fe)(OH) 2] + to be compensated by 2 negative charges X –.
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David Zaslav, president and CEO of Warner Bros. Discovery, sold just over $30 million worth of his stock holdings in the media conglomerate — the first time he’s cashed in shares of the media ...
Al 2 Si 2 O 7, (Al 2 O 3 ·2SiO 2), called metakaolinite, formed from kaolin by heating at 450 °C (842 °F). [5] Al 6 Si 2 O 13, (3Al 2 O 3 ·2SiO 2), the mineral mullite, the only thermodynamically stable intermediate phase in the Al 2 O 3-SiO 2 system at atmospheric pressure. [6] This also called '3:2 mullite' to distinguish it from 2Al 2 O ...